Question

是否可以创建自定义JSF核心Facelet组件。类似<custom:composition> <ui:composition>或<custom:include> <ui:include> 如果有人能告诉我所涉及的步骤，将会很有帮助。

提前致谢，

Kaushal

Answer 1

它本质上是taghandlers。即从TagHandler延伸的课程。

这是一个Hello World标记处理程序。

com.example.HelloTagHandler

public class HelloTagHandler extends TagHandler {

    public HelloTagHandler(TagConfig config) {
        super(config);
    }

    @Override
    public void apply(FaceletContext context, UIComponent parent) throws IOException {
        // Do your job here. This example dynamically adds another component to the parent.
        if (ComponentHandler.isNew(parent)) {
            UIOutput child = new HtmlOutputText();
            child.setValue("Hello World");
            parent.getChildren().add(child);
        }

        nextHandler.apply(context, parent); // Delegate job further to first next tag in tree hierarchy.
    }

}

/WEB-INF/my.taglib.xml

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
    version="2.0"
>
    <namespace>http://example.com/my</namespace>
    <tag>
        <tag-name>hello</tag-name>
        <handler-class>com.example.HelloTagHandler</handler-class>
    </tag>
</facelet-taglib>

/WEB-INF/web.xml（注意：my.taglib.xml位于/META-INF内的/WEB-INF/lib文件夹的<context-param> <param-name>javax.faces.FACELETS_LIBRARIES</param-name> <param-value>/WEB-INF/my.taglib.xml</param-value> </context-param>文件夹中，与JSF组件库一样，此部分不是必需的：

/some.xhtml

<html ... xmlns:my="http://example.com/my"> ... <my:hello />

中的用法

{{1}}

要查看<ui:composition>和<ui:include>的Mojarra实施的源代码，请点击链接。

另见：

When to use <ui:include>, tag files, composite components and/or custom components?

JSF中的自定义Facelet组件

1 个答案:

另见：